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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b39139673298e982e9ea57f86ffc22d7136992d2c73acc091b0d0ca143d82' 
  AND token = 'BxlhCFQ4vhE3O0JbSvE8H/2cT54O11K9hcqR8fLaPeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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