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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ead755731b9a4fd55b46d014b1c9875561f25bbaf86c00abb113e0d4d236aa' 
  AND token = 'F+NDDRcVYk/9idM1qRF/rYPPW6g3Cxuut81dFXEq+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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