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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b94fc285ad8ade98a09d98ec1456066a049dee0aa56017fe3b29e416cbd1c77' 
  AND token = '6zjyLq4E1qj4kXJwWtNwYByYetSx8nJtTgTZWwAwABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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