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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84822ca6852bac444159bfee781396d6b352355cccee13c01dce9acc8aff4434' 
  AND token = 'dLKCX7lKGPNLTEom4sE9eoZ5QC/YWYjfGGepRfw1d5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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