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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0528fc828b3a4cdbbb33d5d46a4e15af2b742d0918abe84f0425d8a7c28bf8d' 
  AND token = 'b9g408O+I7G+n5G/5+fOZx3HfhSthN+/AhLpnftpb44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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