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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0ccef3bebfb93bb0f607dc5e26cca01e3fa8118671fbf2f3b075c2335eca25' 
  AND token = 'G2c8yUP0AIL4tAG/LQTaKqjyteloFvE60vCa5gsBO74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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