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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc5670760141b2f7c9703a90d6b6234659341f0711faf8a0230df52c5fb559e' 
  AND token = 'q5fSqGDYgLoK0ersIc/n5qoVnPk5pfwiipDEXHK/SKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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