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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1f20e11ea0e01ae2a1896375349bf0cd2546b32fd385f8a6fd1ed748d2cec7' 
  AND token = 'KvQ5QiJ3FGlFvKgutaTLASgwZWPUs6iIvW42FHjk1gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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