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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce19837aa3bd0b41f1e2ed9dbd6f8eeaa94c2bbd0004358fada6513a54c77fe' 
  AND token = 'bDz0MgjHfpcMI/GLWc3TURI+rMmUQbsv/UL1mm0U5Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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