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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146e8757b10abf72f32b511a5a4c7666c9cd842db83d63cebbc4e386b21ac6e1' 
  AND token = 'XkaXnWCNdfbswX7ZnCUPq4jckGshI+AIr48a0upqYAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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