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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a71eedd9855da9f9f9dc3ada7df4a9e6198a0d925e9e566e81d3100d1d8d759' 
  AND token = 'nH2dTDCK/FGSDH1dmISp35cipi4x0SicP/QDYcE+8p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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