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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eb34f0eaa0c40e30128ca81d2edbcf05b0ca7af3d0f03034230f2dadd28bdd' 
  AND token = 'CORcpONGg0aT9yHBGPsauHez0VGfaUVknGUs+bmYc68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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