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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d2efae2288bac14781beb119f730e51c35427a7123ce953cb1cbad86f747b5' 
  AND token = 'wk1Q6Lu3+jzJeLo+0HTm9l98q1qL1dKY94upyXKd99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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