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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e804233edfaec39a241d6a5af659d1b811f5bdc2752df0fccb5169ea9e3a0981' 
  AND token = 'Nno9i7GL8NZN/V4i+wvkt7WFLvLK1i2v5INayDLGYG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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