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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b55407904aed21ae529995ade835768bf3d8d0ddfbf260a05a916e552351c23' 
  AND token = '2KBRfslp6cMOfUdHCy4dP0F4LUnjss6pT2J65f/n4oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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