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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba7e82584b9a345bf214eea6b6bdc5b555e8fdc1d8a3554f6e0ca0574e7d62d' 
  AND token = '+OTlL3uoCTyEMO+jCbcYWllet0Fqnop4NDaA4JM5i/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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