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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb4fe310dab0ca052aa74ca13ac7fb1f380c7a5f697259451c766b4834c6462' 
  AND token = '+h0jnIH2JJPWMk3t9zAyFREg3Z/14KxhT6L6vpIoAhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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