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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c42092406724d0a1fe5a754acccc6a4f388dd530cf7b859cf8be52caa15480' 
  AND token = '+AyE+MksDXIZ7VMj6X4yuAKKvfC0Qo481bHp4IN+vy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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