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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f30195c5ddee711723502a3833859e9e0a59746d089defbbb00971f54fa56a' 
  AND token = '4n4DR2V5xrhJs95EHYM0vyQmpZFVb/ui/45TrE3gWpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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