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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0375869c02148741d5c431455f2a9b1ad89c3019daafe48ce17a21a6f742d90c' 
  AND token = 'HkbpE2R5gNdyF5bwddLxTGbZZwfY5Ooq7i9723mSvRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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