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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194e3881f06a1655ca49e75a312817006d89464cd060780fffc8ee36a5c1d6e8' 
  AND token = 'mf3bWHmtWufSiTTy4vj4NoEkm4S+DsAsJ/2iruLStFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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