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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87d3682533368aaedc723112147c0e635f69912f3c3b7d8b736f607568063d1' 
  AND token = '14F55ruyUIxeWqxFSZYIeGPSURUJXmB6N9ai7VdcvNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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