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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc9127a548152b7c30cc7a85ddebb33fa2c7e08ca49777a9a4a94c46ceeb52e' 
  AND token = 'PnIgvG2fuRRLIagJISWSwEWpT1/OeWujVsLpeePMB6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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