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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00f26e9ef6f9c9ff27c1d8ec11a9ae30d674569cbca718acf1c60ef919d7ee8' 
  AND token = 'RBSBkbZuFD+JtF26RCgtq1YOL+OGBNiEj7HKizJ19ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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