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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c415c4b435a69366953498e0f4b415d9b23a4e38c681e7551989756700384cf0' 
  AND token = '92PGN+vER5U2jfpKQK2OYKTu9f4rEIn9JU2NEzl/Rz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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