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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46fe705600698ecf3b261ea579f1726fc6e14173c0a04d588694c6d0f725f4c' 
  AND token = 'm1pSGrCui+l1tA1KovPp5hqur7fgaVCAAw6f5jAkcoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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