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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ecca828123f77946215ac54ac99b65fe3efe35d8c0e5cbad5a9f9d51e44dbd' 
  AND token = '1cTJGJA7ciAHZvFgUw94CQK3B2I1uoWjlpEsgyrS/Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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