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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c8742f83f269568770c7cf58fcc9fe7cad8dfa1ae50411b4b7c4049b1139cc' 
  AND token = '9mrtiv2PVG2Aq1uKXxMSqaiGK65TPVq+atpkxT4Ip+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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