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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9049b6de14be07e0526dc3f7f2f4facb53b4153afde2f3bafef5fa8a3a5a1fe' 
  AND token = 'o5Pl+Z5isKyCzzbSsO68XglXk1r71KCwsTOUd7ip/+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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