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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6e2d9330c297525b9673cc9bed7bf8fae41c717610febaabe70e4eb5fe6d83' 
  AND token = 'yll4GEA/60eibuWfiXf42uUw51phBZQ/JviOcSRkrLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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