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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95657a38c96fa6beb66fc80e229fe33261e6e1e03ec47eb79f9ec76d06538ae8' 
  AND token = 'Uc1bEsfLk7AyK29Dh2TTzQwL7q8SshoLm6dGastWFKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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