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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2ada64724dd5e2da5a2cf9ee3ab03df5e20608ed9fc4b0152d089b3b3325ff' 
  AND token = 'ZAaVF+Ryy36j1zzsx8C/h7VGwgkt8H3mBy3MbBlB62I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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