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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b0395c6c3054592a1011d9cc73a7db45487b43af59d91cb75a34c9c67327ea' 
  AND token = 'dqKw+QmZWDf1H+m0Vi7+xvB+k1VAox0naZNoj2gEKig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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