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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54b580e3c8eba7e26c3b6492abae03d1da5eaaac9db096f3df209df92058097' 
  AND token = 'RtuXo8iAcsGQJa1H6iNLh610bOHwlcs0SNH7m6ssFtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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