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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3085a035e815f3ac1f57501fd2b8302e17fdb2134153073e0d02fdc3242e46' 
  AND token = '9YARZeS22/W1eZ2XrekRUAU0DDK6hIOkqWRLXLBX19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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