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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c326c34c0cc9949237cbd0df00687cf3a6301270dac9007e02c5991234776be1' 
  AND token = 'ekHAjk2iL3tGPs/gooBnAr0yye9DCghglqRZYzyBoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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