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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91c1866aaff36fe67633fa629d02481fd7e4aba7b2590a79d4d79e7cc887048' 
  AND token = 'nKjm446JCx+t896qu5tv0JlEL8pvFORH2b2JGK8xL14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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