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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620be5d8ee918a707aeee996c2520a8d46e8ea38db01e49cc855d23eff12dfc' 
  AND token = '4TOsPywh7RLUHSzbiSSMnu3dOHVKQ5qwA1XRDHnsCpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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