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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed6d6a5922cb14fc29d23c97c53b0e4abc15b762f791480286f13311fcf60f5' 
  AND token = 'Ge+4b6aoUOv0l/81ijV1Ai7eb5O6JXO8LdjgT3dR6EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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