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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb366fe65c37dcc14cb1623555925a16fbabc90b213938afe24af5c0b550cb0f' 
  AND token = 'MS0VPgLADYh5P8b+Wi11xrutMu4Z6GtS6nrL3iTDsA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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