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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df63df2f83e4a3e306fdc5aa3c599d145f067fe99a9048335defcb1a77adfe3' 
  AND token = 'CU16cqXrzUf9T/r/Mcras0YK2RYR4kGsNzBt1kf5STE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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