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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7406e2b902e3377e5f5ae1111b1381d68795f5b80864d60d9fb0d46b996d6f5' 
  AND token = 'YkIhZAPBIA22tnZO79IoOARTMn1fydBOzw/1eFpOuIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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