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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7025df86e79b524382aa7ed4d3e85cbfc95578f224eab38c082fc4a34dac01f2' 
  AND token = '33lp0/HE+R7KEjOxXLalYA5flsasoasaF6ZvFxblqlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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