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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413dbfe18e35de017dea8bfb3a6fe68bf04080221cbcccfa2ddd856f906845f5' 
  AND token = 'Nj1Q9BQ+V/IfrsRBWEdw9ekAfxnPcpP/qEmkeAwcpUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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