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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9931b587d2d962b98191937874428bf6c128b0bcf7747ed21feec72d92b0e2' 
  AND token = 'Q7qbVLYhY04n5IMQ5LD92aU4NiFeUAs8ZIk3t76PxGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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