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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2567da7ca000573c1e4978ba95555a4acd7d3d8b3d2cf5f78ac8a0a9b5de5f04' 
  AND token = 'AH0CfFklcG4pvW9yhwWmPMbxickcA0BBww/SyKEBuY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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