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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be93f16055845ee3fa9d9cbbc54728763d34502b584be2c1678ab9a373a95dd9' 
  AND token = '38Nm+bn67MiP9O66Dx0TbWj8dYMok1R7Pwp1PBqcFB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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