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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acfb574c5eec27ad6d2ee8f783b1b29c17cf26a00fe69631e1437e3f1b3ac33' 
  AND token = 'hh7tRAJPv0Jc+rfI+AYBIHBrAxxwmxiIbbOsmSLUNR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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