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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ece2994faed4262425e6518c69bbf94be5fb57c124e1e2ced5e14dfaca4cd4e' 
  AND token = 'q1qiT3dJ9EQnV0EEfqg0okMV85FZkguzxF3Cf+bwK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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