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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23c4a0c1a44fc467301b50159f10b44417cc468d1d94bc881a70bb933923b49' 
  AND token = 'h3Hmzhm0NB9he2b94znVFEZB1VETcr2NNB0DFTbaeIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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