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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76954b0022606f6ab5abc9b1092314699411a196123df185d47247c982eb4e2' 
  AND token = '/qD62KYjq48xfA1/q1/mPR6RUsm+b3ZONRx+W6RvSz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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