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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662f8086cb4f0afde25f65af28aa62a657c2106ba39a0842bc902a09ece95416' 
  AND token = 'TNB4sL8WLAwymEmKsD4OvDhsKff0iV+QqkdgQs98VfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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