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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8355f5d45fb36b8da4abe2044d50d30321371e38e775adec2f05297e7acd6600' 
  AND token = '/mkqTJ88e7p8tXfdN1qDLEqwThnQG7P5CHwTZa5S2Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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