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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f579e694faa6582a217c2661708f55cbd88609e009281b4b7b0181aa7a0eef95' 
  AND token = 'FiNapYiPgFpETrLawYG/znIsuML3QjHlCsmQR2/fkss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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