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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1a92f7b209499e60dd296ec53d091a8a92af5dd8f95ae1998cc73c9fa214f1' 
  AND token = 'Oyi3d6/6bF8yP3un5/mF7rXaGuQCbJJK4k6nBxT2rlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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