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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d00dd9ce94f292603970b4b2d29309f0d63f269a45b8b18e7a58838b6db4dcf' 
  AND token = 'ywcd/9PURsEXvQUfPmJO6ZeefT76yDHH6BcaB18QVnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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