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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e95edc45577ed7c6b1e4f371b903d67bc6ab9f2adf02c5835e30e8c31fddbfa' 
  AND token = 'mZH3EkHsaD4Tw0oXRu7DOANCUrQmvsDuyVYWYBe6Puw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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