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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de672d5df1e23537cbb05dbae80c2ace57aebc97c1dfdf2013800330b1da1b2e' 
  AND token = 'm3z28qc4yzumQIz4o3lIeRc9rjaxSXtpx7VsCb+iw4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}