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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0891509175f0f16dfff4446184f56cf008c116b10f53402d7d3a1e89fa38999e' 
  AND token = 'ElL776ohYzxDREa+uESo44B4j9AOcQ+infYSUIZR2MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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