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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb02949d1c611f691ef823dcf216a570c0bef33ba2bad2cf340be4294e144609' 
  AND token = 'vmFOYeTcGq2nT4lZ2vWtj7MiMfi7NhA3PUt8NxsGIx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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