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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a889cfc6951913e4218b1792f3ff27b9cc3752269b119e0e40e59246f8d7a098' 
  AND token = 'cuJr5OA7KTwHlzFGNHj92KFHeFMu5yUjSGAj1tqd07U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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