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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb426508331b92e9f1cc68606511bbb182b02f537901976c7d92bdccb5c455ca' 
  AND token = 'eUrUkurY5GL/GwT66pPBRpfU2ij+KezAyCc4B1V0jFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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