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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7703afcabe3632bf4b4bd8c162d1657450b3cfce19390629d28b183389bb59' 
  AND token = '5gVqebPdNDwXjv/4kOTQpfmO730A0WeJY4tvJkKwkH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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