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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a252eafd4b2e671497a56bcfb7538b38dea54c72e06c1af6ef0eb36672de04f9' 
  AND token = 'ZwUNiYvnnU/etPefbVA5wb5F/iX1gULz7xxw1g/7fko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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